Re: want to coexist Ubuntu 12.10 and Lubuntu 12.10
1. Yes, the swap can be shared.
2. Don't use windows tools to shrink linux partitions. If you do have to shrink it, first make a full backup of all important data, then use the ubuntu live cd to boot into live mode and use Gparted to shrink it.
3. You can install lubuntu using the auto methods, or manually which I always prefer and recommend. Manually you can make sure you tell it to use the existing swap, if it does it automatically I'm not sure whether it will create new swap into the unallocated space or not.
4. Lubuntu will install its own grub2 but if you prefer to use grub2 from ubuntu, you can boot ubuntu once after the lubuntu installation is finished, and install its grub2 back to the MBR.
Darko.
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Ubuntu 18.04 LTS 64bit
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